// JavaScript Document
var active_div = "Q_1"

function swap_div(div_id){
	if (active_div==div_id || div_id=="Q_0") { return;}
	elm_to_activate = document.getElementById(div_id);
	elm_active = document.getElementById(active_div);
	active_div = elm_to_activate.id;
	elm_active.style.visibility="hidden";
	elm_to_activate.style.visibility="visible";
}